Last week, a new video surfaced claiming to show a live woolly mammoth — an animal scientists think has been extinct for at least four millennia — crossing a river in Russia. The suspiciously blurry footage was allegedly "caught by a government-employed engineer last summer in the Chukotka Autonomous Okrug region of Siberia," according to a story in The Sun newspaper. The video became an Internet sensation, making headlines around the world. Some Bigfoot believers and Loch Ness Monster lovers murmured their tentative approval, hoping it proved that large unknown (or assumed extinct) animals still exist in Earth's remote wilds. While most people didn't believe that the animal in the video was really a woolly mammoth as claimed, viewers were sharply divided about what exactly it was.